Electrochemical Splitting of Methane in Molten Salts To Produce Hydrogen
Electrochemical Splitting of Methane in Molten Salts To Produce Hydrogen
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DOI：
10.1002/anie.202017243
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发表时间：
2021-03-03
影响因子：
16.6
通讯作者：
Xiao, Wei
中科院分区：
文献类型：
--
作者：
Fan, Zeyu;Xiao, Wei
基于甲烷水蒸气重整（MSR）的工业制氢仍然存在碳排放密集、由于催化剂上的焦炭沉积而导致的制氢延迟和水的巨大消耗等挑战。本文报道了在500 ℃熔盐中甲烷的电化学裂解（ESM），以节能、无排放和无水的方式制氢。甲烷在阳极电化学氧化生成二氧化碳和氢气，这是甲烷转化为氢气最节能的途径。所产生的阳极二氧化碳被熔体原位捕获并在阴极处还原为固体碳，使得阳极氢产生与阴极碳沉积在空间上分离。对制氢技术的生命周期评估表明，ESM的等效碳排放量远低于MSR，等效能量投入低于碱性水电解。
Industrial hydrogen production based on methane steam reforming (MSR) remains challenges in intensive carbon emissions, retarded hydrogen generation owing to coke deposition over catalysts and huge consumption of water. We herein report an electrochemical splitting of methane (ESM) in molten salts at 500 degrees C to produce hydrogen in an energy saving, emission-free and water-free manner. Following the most energy-saving route on methane-to-hydrogen conversion, methane is electrochemically oxidized at anode to generate carbon dioxide and hydrogen. The generated anodic carbon dioxide is in situ captured by the melts and reduced to solid carbon at cathode, enabling a spatial separation of anodic hydrogen generation from cathodic carbon deposition. Life-cycle assessment on hydrogen-generation technologies shows that the ESM experiences an equivalent carbon emission much lower than MSR, and a lower equivalent energy input than alkaline water electrolysis.